sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/module.h>
  28 #include <linux/string.h>
  29 #include <sound/core.h>
  30 #include <sound/timer.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/minors.h>
  34 #include <sound/initval.h>
  35 #include <linux/kmod.h>
  36
  37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
  38 #define DEFAULT_TIMER_LIMIT 4
  39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
  40 #define DEFAULT_TIMER_LIMIT 2
  41 #else
  42 #define DEFAULT_TIMER_LIMIT 1
  43 #endif
  44
  45 static int timer_limit = DEFAULT_TIMER_LIMIT;
  46 static int timer_tstamp_monotonic = 1;
  47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  48 MODULE_DESCRIPTION("ALSA timer interface");
  49 MODULE_LICENSE("GPL");
  50 module_param(timer_limit, int, 0444);
  51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  52 module_param(timer_tstamp_monotonic, int, 0444);
  53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  54
  55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  56 MODULE_ALIAS("devname:snd/timer");
  57
  58 struct snd_timer_user {
  59         struct snd_timer_instance *timeri;
  60         int tread;              /* enhanced read with timestamps and events */
  61         unsigned long ticks;
  62         unsigned long overrun;
  63         int qhead;
  64         int qtail;
  65         int qused;
  66         int queue_size;
  67         struct snd_timer_read *queue;
  68         struct snd_timer_tread *tqueue;
  69         spinlock_t qlock;
  70         unsigned long last_resolution;
  71         unsigned int filter;
  72         struct timespec tstamp;         /* trigger tstamp */
  73         wait_queue_head_t qchange_sleep;
  74         struct fasync_struct *fasync;
  75         struct mutex ioctl_lock;
  76 };
  77
  78 /* list of timers */
  79 static LIST_HEAD(snd_timer_list);
  80
  81 /* list of slave instances */
  82 static LIST_HEAD(snd_timer_slave_list);
  83
  84 /* lock for slave active lists */
  85 static DEFINE_SPINLOCK(slave_active_lock);
  86
  87 static DEFINE_MUTEX(register_mutex);
  88
  89 static int snd_timer_free(struct snd_timer *timer);
  90 static int snd_timer_dev_free(struct snd_device *device);
  91 static int snd_timer_dev_register(struct snd_device *device);
  92 static int snd_timer_dev_disconnect(struct snd_device *device);
  93
  94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  95
  96 /*
  97  * create a timer instance with the given owner string.
  98  * when timer is not NULL, increments the module counter
  99  */
 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 101                                                          struct snd_timer *timer)
 102 {
 103         struct snd_timer_instance *timeri;
 104         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 105         if (timeri == NULL)
 106                 return NULL;
 107         timeri->owner = kstrdup(owner, GFP_KERNEL);
 108         if (! timeri->owner) {
 109                 kfree(timeri);
 110                 return NULL;
 111         }
 112         INIT_LIST_HEAD(&timeri->open_list);
 113         INIT_LIST_HEAD(&timeri->active_list);
 114         INIT_LIST_HEAD(&timeri->ack_list);
 115         INIT_LIST_HEAD(&timeri->slave_list_head);
 116         INIT_LIST_HEAD(&timeri->slave_active_head);
 117
 118         timeri->timer = timer;
 119         if (timer && !try_module_get(timer->module)) {
 120                 kfree(timeri->owner);
 121                 kfree(timeri);
 122                 return NULL;
 123         }
 124
 125         return timeri;
 126 }
 127
 128 /*
 129  * find a timer instance from the given timer id
 130  */
 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 132 {
 133         struct snd_timer *timer = NULL;
 134
 135         list_for_each_entry(timer, &snd_timer_list, device_list) {
 136                 if (timer->tmr_class != tid->dev_class)
 137                         continue;
 138                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 139                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 140                     (timer->card == NULL ||
 141                      timer->card->number != tid->card))
 142                         continue;
 143                 if (timer->tmr_device != tid->device)
 144                         continue;
 145                 if (timer->tmr_subdevice != tid->subdevice)
 146                         continue;
 147                 return timer;
 148         }
 149         return NULL;
 150 }
 151
 152 #ifdef CONFIG_MODULES
 153
 154 static void snd_timer_request(struct snd_timer_id *tid)
 155 {
 156         switch (tid->dev_class) {
 157         case SNDRV_TIMER_CLASS_GLOBAL:
 158                 if (tid->device < timer_limit)
 159                         request_module("snd-timer-%i", tid->device);
 160                 break;
 161         case SNDRV_TIMER_CLASS_CARD:
 162         case SNDRV_TIMER_CLASS_PCM:
 163                 if (tid->card < snd_ecards_limit)
 164                         request_module("snd-card-%i", tid->card);
 165                 break;
 166         default:
 167                 break;
 168         }
 169 }
 170
 171 #endif
 172
 173 /*
 174  * look for a master instance matching with the slave id of the given slave.
 175  * when found, relink the open_link of the slave.
 176  *
 177  * call this with register_mutex down.
 178  */
 179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 180 {
 181         struct snd_timer *timer;
 182         struct snd_timer_instance *master;
 183
 184         /* FIXME: it's really dumb to look up all entries.. */
 185         list_for_each_entry(timer, &snd_timer_list, device_list) {
 186                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 187                         if (slave->slave_class == master->slave_class &&
 188                             slave->slave_id == master->slave_id) {
 189                                 list_move_tail(&slave->open_list,
 190                                                &master->slave_list_head);
 191                                 spin_lock_irq(&slave_active_lock);
 192                                 slave->master = master;
 193                                 slave->timer = master->timer;
 194                                 spin_unlock_irq(&slave_active_lock);
 195                                 return;
 196                         }
 197                 }
 198         }
 199 }
 200
 201 /*
 202  * look for slave instances matching with the slave id of the given master.
 203  * when found, relink the open_link of slaves.
 204  *
 205  * call this with register_mutex down.
 206  */
 207 static void snd_timer_check_master(struct snd_timer_instance *master)
 208 {
 209         struct snd_timer_instance *slave, *tmp;
 210
 211         /* check all pending slaves */
 212         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 213                 if (slave->slave_class == master->slave_class &&
 214                     slave->slave_id == master->slave_id) {
 215                         list_move_tail(&slave->open_list, &master->slave_list_head);
 216                         spin_lock_irq(&slave_active_lock);
 217                         spin_lock(&master->timer->lock);
 218                         slave->master = master;
 219                         slave->timer = master->timer;
 220                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 221                                 list_add_tail(&slave->active_list,
 222                                               &master->slave_active_head);
 223                         spin_unlock(&master->timer->lock);
 224                         spin_unlock_irq(&slave_active_lock);
 225                 }
 226         }
 227 }
 228
 229 /*
 230  * open a timer instance
 231  * when opening a master, the slave id must be here given.
 232  */
 233 int snd_timer_open(struct snd_timer_instance **ti,
 234                    char *owner, struct snd_timer_id *tid,
 235                    unsigned int slave_id)
 236 {
 237         struct snd_timer *timer;
 238         struct snd_timer_instance *timeri = NULL;
 239
 240         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 241                 /* open a slave instance */
 242                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 243                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 244                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
 245                         return -EINVAL;
 246                 }
 247                 mutex_lock(&register_mutex);
 248                 timeri = snd_timer_instance_new(owner, NULL);
 249                 if (!timeri) {
 250                         mutex_unlock(&register_mutex);
 251                         return -ENOMEM;
 252                 }
 253                 timeri->slave_class = tid->dev_sclass;
 254                 timeri->slave_id = tid->device;
 255                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 256                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 257                 snd_timer_check_slave(timeri);
 258                 mutex_unlock(&register_mutex);
 259                 *ti = timeri;
 260                 return 0;
 261         }
 262
 263         /* open a master instance */
 264         mutex_lock(&register_mutex);
 265         timer = snd_timer_find(tid);
 266 #ifdef CONFIG_MODULES
 267         if (!timer) {
 268                 mutex_unlock(&register_mutex);
 269                 snd_timer_request(tid);
 270                 mutex_lock(&register_mutex);
 271                 timer = snd_timer_find(tid);
 272         }
 273 #endif
 274         if (!timer) {
 275                 mutex_unlock(&register_mutex);
 276                 return -ENODEV;
 277         }
 278         if (!list_empty(&timer->open_list_head)) {
 279                 timeri = list_entry(timer->open_list_head.next,
 280                                     struct snd_timer_instance, open_list);
 281                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 282                         mutex_unlock(&register_mutex);
 283                         return -EBUSY;
 284                 }
 285         }
 286         timeri = snd_timer_instance_new(owner, timer);
 287         if (!timeri) {
 288                 mutex_unlock(&register_mutex);
 289                 return -ENOMEM;
 290         }
 291         timeri->slave_class = tid->dev_sclass;
 292         timeri->slave_id = slave_id;
 293
 294         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 295                 int err = timer->hw.open(timer);
 296                 if (err) {
 297                         kfree(timeri->owner);
 298                         kfree(timeri);
 299
 300                         module_put(timer->module);
 301                         mutex_unlock(&register_mutex);
 302                         return err;
 303                 }
 304         }
 305
 306         list_add_tail(&timeri->open_list, &timer->open_list_head);
 307         snd_timer_check_master(timeri);
 308         mutex_unlock(&register_mutex);
 309         *ti = timeri;
 310         return 0;
 311 }
 312
 313 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event);
 314
 315 /*
 316  * close a timer instance
 317  */
 318 int snd_timer_close(struct snd_timer_instance *timeri)
 319 {
 320         struct snd_timer *timer = NULL;
 321         struct snd_timer_instance *slave, *tmp;
 322
 323         if (snd_BUG_ON(!timeri))
 324                 return -ENXIO;
 325
 326         /* force to stop the timer */
 327         snd_timer_stop(timeri);
 328
 329         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 330                 /* wait, until the active callback is finished */
 331                 spin_lock_irq(&slave_active_lock);
 332                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 333                         spin_unlock_irq(&slave_active_lock);
 334                         udelay(10);
 335                         spin_lock_irq(&slave_active_lock);
 336                 }
 337                 spin_unlock_irq(&slave_active_lock);
 338                 mutex_lock(&register_mutex);
 339                 list_del(&timeri->open_list);
 340                 mutex_unlock(&register_mutex);
 341         } else {
 342                 timer = timeri->timer;
 343                 if (snd_BUG_ON(!timer))
 344                         goto out;
 345                 /* wait, until the active callback is finished */
 346                 spin_lock_irq(&timer->lock);
 347                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 348                         spin_unlock_irq(&timer->lock);
 349                         udelay(10);
 350                         spin_lock_irq(&timer->lock);
 351                 }
 352                 spin_unlock_irq(&timer->lock);
 353                 mutex_lock(&register_mutex);
 354                 list_del(&timeri->open_list);
 355                 if (list_empty(&timer->open_list_head) &&
 356                     timer->hw.close)
 357                         timer->hw.close(timer);
 358                 /* remove slave links */
 359                 spin_lock_irq(&slave_active_lock);
 360                 spin_lock(&timer->lock);
 361                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 362                                          open_list) {
 363                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 364                         slave->master = NULL;
 365                         slave->timer = NULL;
 366                         list_del_init(&slave->ack_list);
 367                         list_del_init(&slave->active_list);
 368                 }
 369                 spin_unlock(&timer->lock);
 370                 spin_unlock_irq(&slave_active_lock);
 371                 mutex_unlock(&register_mutex);
 372         }
 373  out:
 374         if (timeri->private_free)
 375                 timeri->private_free(timeri);
 376         kfree(timeri->owner);
 377         kfree(timeri);
 378         if (timer)
 379                 module_put(timer->module);
 380         return 0;
 381 }
 382
 383 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 384 {
 385         struct snd_timer * timer;
 386
 387         if (timeri == NULL)
 388                 return 0;
 389         if ((timer = timeri->timer) != NULL) {
 390                 if (timer->hw.c_resolution)
 391                         return timer->hw.c_resolution(timer);
 392                 return timer->hw.resolution;
 393         }
 394         return 0;
 395 }
 396
 397 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 398 {
 399         struct snd_timer *timer;
 400         unsigned long flags;
 401         unsigned long resolution = 0;
 402         struct snd_timer_instance *ts;
 403         struct timespec tstamp;
 404
 405         if (timer_tstamp_monotonic)
 406                 do_posix_clock_monotonic_gettime(&tstamp);
 407         else
 408                 getnstimeofday(&tstamp);
 409         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 410                        event > SNDRV_TIMER_EVENT_PAUSE))
 411                 return;
 412         if (event == SNDRV_TIMER_EVENT_START ||
 413             event == SNDRV_TIMER_EVENT_CONTINUE)
 414                 resolution = snd_timer_resolution(ti);
 415         if (ti->ccallback)
 416                 ti->ccallback(ti, event, &tstamp, resolution);
 417         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 418                 return;
 419         timer = ti->timer;
 420         if (timer == NULL)
 421                 return;
 422         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 423                 return;
 424         spin_lock_irqsave(&timer->lock, flags);
 425         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 426                 if (ts->ccallback)
 427                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 428         spin_unlock_irqrestore(&timer->lock, flags);
 429 }
 430
 431 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
 432                             unsigned long sticks)
 433 {
 434         list_move_tail(&timeri->active_list, &timer->active_list_head);
 435         if (timer->running) {
 436                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 437                         goto __start_now;
 438                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 439                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 440                 return 1;       /* delayed start */
 441         } else {
 442                 timer->sticks = sticks;
 443                 timer->hw.start(timer);
 444               __start_now:
 445                 timer->running++;
 446                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 447                 return 0;
 448         }
 449 }
 450
 451 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
 452 {
 453         unsigned long flags;
 454
 455         spin_lock_irqsave(&slave_active_lock, flags);
 456         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 457                 spin_unlock_irqrestore(&slave_active_lock, flags);
 458                 return -EBUSY;
 459         }
 460         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 461         if (timeri->master && timeri->timer) {
 462                 spin_lock(&timeri->timer->lock);
 463                 list_add_tail(&timeri->active_list,
 464                               &timeri->master->slave_active_head);
 465                 spin_unlock(&timeri->timer->lock);
 466         }
 467         spin_unlock_irqrestore(&slave_active_lock, flags);
 468         return 1; /* delayed start */
 469 }
 470
 471 /*
 472  *  start the timer instance
 473  */
 474 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 475 {
 476         struct snd_timer *timer;
 477         int result = -EINVAL;
 478         unsigned long flags;
 479
 480         if (timeri == NULL || ticks < 1)
 481                 return -EINVAL;
 482         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 483                 result = snd_timer_start_slave(timeri);
 484                 if (result >= 0)
 485                         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 486                 return result;
 487         }
 488         timer = timeri->timer;
 489         if (timer == NULL)
 490                 return -EINVAL;
 491         spin_lock_irqsave(&timer->lock, flags);
 492         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 493                              SNDRV_TIMER_IFLG_START)) {
 494                 result = -EBUSY;
 495                 goto unlock;
 496         }
 497         timeri->ticks = timeri->cticks = ticks;
 498         timeri->pticks = 0;
 499         result = snd_timer_start1(timer, timeri, ticks);
 500  unlock:
 501         spin_unlock_irqrestore(&timer->lock, flags);
 502         if (result >= 0)
 503                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 504         return result;
 505 }
 506
 507 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event)
 508 {
 509         struct snd_timer *timer;
 510         unsigned long flags;
 511
 512         if (snd_BUG_ON(!timeri))
 513                 return -ENXIO;
 514
 515         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 516                 spin_lock_irqsave(&slave_active_lock, flags);
 517                 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 518                         spin_unlock_irqrestore(&slave_active_lock, flags);
 519                         return -EBUSY;
 520                 }
 521                 if (timeri->timer)
 522                         spin_lock(&timeri->timer->lock);
 523                 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 524                 list_del_init(&timeri->ack_list);
 525                 list_del_init(&timeri->active_list);
 526                 if (timeri->timer)
 527                         spin_unlock(&timeri->timer->lock);
 528                 spin_unlock_irqrestore(&slave_active_lock, flags);
 529                 goto __end;
 530         }
 531         timer = timeri->timer;
 532         if (!timer)
 533                 return -EINVAL;
 534         spin_lock_irqsave(&timer->lock, flags);
 535         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 536                                SNDRV_TIMER_IFLG_START))) {
 537                 spin_unlock_irqrestore(&timer->lock, flags);
 538                 return -EBUSY;
 539         }
 540         list_del_init(&timeri->ack_list);
 541         list_del_init(&timeri->active_list);
 542         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 543             !(--timer->running)) {
 544                 timer->hw.stop(timer);
 545                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 546                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 547                         snd_timer_reschedule(timer, 0);
 548                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 549                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 550                                 timer->hw.start(timer);
 551                         }
 552                 }
 553         }
 554         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 555         spin_unlock_irqrestore(&timer->lock, flags);
 556       __end:
 557         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 558                 snd_timer_notify1(timeri, event);
 559         return 0;
 560 }
 561
 562 /*
 563  * stop the timer instance.
 564  *
 565  * do not call this from the timer callback!
 566  */
 567 int snd_timer_stop(struct snd_timer_instance *timeri)
 568 {
 569         struct snd_timer *timer;
 570         unsigned long flags;
 571         int err;
 572
 573         err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
 574         if (err < 0)
 575                 return err;
 576         timer = timeri->timer;
 577         if (!timer)
 578                 return -EINVAL;
 579         spin_lock_irqsave(&timer->lock, flags);
 580         timeri->cticks = timeri->ticks;
 581         timeri->pticks = 0;
 582         spin_unlock_irqrestore(&timer->lock, flags);
 583         return 0;
 584 }
 585
 586 /*
 587  * start again..  the tick is kept.
 588  */
 589 int snd_timer_continue(struct snd_timer_instance *timeri)
 590 {
 591         struct snd_timer *timer;
 592         int result = -EINVAL;
 593         unsigned long flags;
 594
 595         if (timeri == NULL)
 596                 return result;
 597         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 598                 return snd_timer_start_slave(timeri);
 599         timer = timeri->timer;
 600         if (! timer)
 601                 return -EINVAL;
 602         spin_lock_irqsave(&timer->lock, flags);
 603         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 604                 result = -EBUSY;
 605                 goto unlock;
 606         }
 607         if (!timeri->cticks)
 608                 timeri->cticks = 1;
 609         timeri->pticks = 0;
 610         result = snd_timer_start1(timer, timeri, timer->sticks);
 611  unlock:
 612         spin_unlock_irqrestore(&timer->lock, flags);
 613         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 614         return result;
 615 }
 616
 617 /*
 618  * pause.. remember the ticks left
 619  */
 620 int snd_timer_pause(struct snd_timer_instance * timeri)
 621 {
 622         return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE);
 623 }
 624
 625 /*
 626  * reschedule the timer
 627  *
 628  * start pending instances and check the scheduling ticks.
 629  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 630  */
 631 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 632 {
 633         struct snd_timer_instance *ti;
 634         unsigned long ticks = ~0UL;
 635
 636         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 637                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 638                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 639                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 640                         timer->running++;
 641                 }
 642                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 643                         if (ticks > ti->cticks)
 644                                 ticks = ti->cticks;
 645                 }
 646         }
 647         if (ticks == ~0UL) {
 648                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 649                 return;
 650         }
 651         if (ticks > timer->hw.ticks)
 652                 ticks = timer->hw.ticks;
 653         if (ticks_left != ticks)
 654                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 655         timer->sticks = ticks;
 656 }
 657
 658 /*
 659  * timer tasklet
 660  *
 661  */
 662 static void snd_timer_tasklet(unsigned long arg)
 663 {
 664         struct snd_timer *timer = (struct snd_timer *) arg;
 665         struct snd_timer_instance *ti;
 666         struct list_head *p;
 667         unsigned long resolution, ticks;
 668         unsigned long flags;
 669
 670         spin_lock_irqsave(&timer->lock, flags);
 671         /* now process all callbacks */
 672         while (!list_empty(&timer->sack_list_head)) {
 673                 p = timer->sack_list_head.next;         /* get first item */
 674                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 675
 676                 /* remove from ack_list and make empty */
 677                 list_del_init(p);
 678
 679                 ticks = ti->pticks;
 680                 ti->pticks = 0;
 681                 resolution = ti->resolution;
 682
 683                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 684                 spin_unlock(&timer->lock);
 685                 if (ti->callback)
 686                         ti->callback(ti, resolution, ticks);
 687                 spin_lock(&timer->lock);
 688                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 689         }
 690         spin_unlock_irqrestore(&timer->lock, flags);
 691 }
 692
 693 /*
 694  * timer interrupt
 695  *
 696  * ticks_left is usually equal to timer->sticks.
 697  *
 698  */
 699 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 700 {
 701         struct snd_timer_instance *ti, *ts, *tmp;
 702         unsigned long resolution, ticks;
 703         struct list_head *p, *ack_list_head;
 704         unsigned long flags;
 705         int use_tasklet = 0;
 706
 707         if (timer == NULL)
 708                 return;
 709
 710         spin_lock_irqsave(&timer->lock, flags);
 711
 712         /* remember the current resolution */
 713         if (timer->hw.c_resolution)
 714                 resolution = timer->hw.c_resolution(timer);
 715         else
 716                 resolution = timer->hw.resolution;
 717
 718         /* loop for all active instances
 719          * Here we cannot use list_for_each_entry because the active_list of a
 720          * processed instance is relinked to done_list_head before the callback
 721          * is called.
 722          */
 723         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 724                                  active_list) {
 725                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 726                         continue;
 727                 ti->pticks += ticks_left;
 728                 ti->resolution = resolution;
 729                 if (ti->cticks < ticks_left)
 730                         ti->cticks = 0;
 731                 else
 732                         ti->cticks -= ticks_left;
 733                 if (ti->cticks) /* not expired */
 734                         continue;
 735                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 736                         ti->cticks = ti->ticks;
 737                 } else {
 738                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 739                         --timer->running;
 740                         list_del_init(&ti->active_list);
 741                 }
 742                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 743                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 744                         ack_list_head = &timer->ack_list_head;
 745                 else
 746                         ack_list_head = &timer->sack_list_head;
 747                 if (list_empty(&ti->ack_list))
 748                         list_add_tail(&ti->ack_list, ack_list_head);
 749                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 750                         ts->pticks = ti->pticks;
 751                         ts->resolution = resolution;
 752                         if (list_empty(&ts->ack_list))
 753                                 list_add_tail(&ts->ack_list, ack_list_head);
 754                 }
 755         }
 756         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 757                 snd_timer_reschedule(timer, timer->sticks);
 758         if (timer->running) {
 759                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 760                         timer->hw.stop(timer);
 761                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 762                 }
 763                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 764                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 765                         /* restart timer */
 766                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 767                         timer->hw.start(timer);
 768                 }
 769         } else {
 770                 timer->hw.stop(timer);
 771         }
 772
 773         /* now process all fast callbacks */
 774         while (!list_empty(&timer->ack_list_head)) {
 775                 p = timer->ack_list_head.next;          /* get first item */
 776                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 777
 778                 /* remove from ack_list and make empty */
 779                 list_del_init(p);
 780
 781                 ticks = ti->pticks;
 782                 ti->pticks = 0;
 783
 784                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 785                 spin_unlock(&timer->lock);
 786                 if (ti->callback)
 787                         ti->callback(ti, resolution, ticks);
 788                 spin_lock(&timer->lock);
 789                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 790         }
 791
 792         /* do we have any slow callbacks? */
 793         use_tasklet = !list_empty(&timer->sack_list_head);
 794         spin_unlock_irqrestore(&timer->lock, flags);
 795
 796         if (use_tasklet)
 797                 tasklet_schedule(&timer->task_queue);
 798 }
 799
 800 /*
 801
 802  */
 803
 804 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 805                   struct snd_timer **rtimer)
 806 {
 807         struct snd_timer *timer;
 808         int err;
 809         static struct snd_device_ops ops = {
 810                 .dev_free = snd_timer_dev_free,
 811                 .dev_register = snd_timer_dev_register,
 812                 .dev_disconnect = snd_timer_dev_disconnect,
 813         };
 814
 815         if (snd_BUG_ON(!tid))
 816                 return -EINVAL;
 817         if (rtimer)
 818                 *rtimer = NULL;
 819         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 820         if (timer == NULL) {
 821                 snd_printk(KERN_ERR "timer: cannot allocate\n");
 822                 return -ENOMEM;
 823         }
 824         timer->tmr_class = tid->dev_class;
 825         timer->card = card;
 826         timer->tmr_device = tid->device;
 827         timer->tmr_subdevice = tid->subdevice;
 828         if (id)
 829                 strlcpy(timer->id, id, sizeof(timer->id));
 830         timer->sticks = 1;
 831         INIT_LIST_HEAD(&timer->device_list);
 832         INIT_LIST_HEAD(&timer->open_list_head);
 833         INIT_LIST_HEAD(&timer->active_list_head);
 834         INIT_LIST_HEAD(&timer->ack_list_head);
 835         INIT_LIST_HEAD(&timer->sack_list_head);
 836         spin_lock_init(&timer->lock);
 837         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 838                      (unsigned long)timer);
 839         if (card != NULL) {
 840                 timer->module = card->module;
 841                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 842                 if (err < 0) {
 843                         snd_timer_free(timer);
 844                         return err;
 845                 }
 846         }
 847         if (rtimer)
 848                 *rtimer = timer;
 849         return 0;
 850 }
 851
 852 static int snd_timer_free(struct snd_timer *timer)
 853 {
 854         if (!timer)
 855                 return 0;
 856
 857         mutex_lock(&register_mutex);
 858         if (! list_empty(&timer->open_list_head)) {
 859                 struct list_head *p, *n;
 860                 struct snd_timer_instance *ti;
 861                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
 862                 list_for_each_safe(p, n, &timer->open_list_head) {
 863                         list_del_init(p);
 864                         ti = list_entry(p, struct snd_timer_instance, open_list);
 865                         ti->timer = NULL;
 866                 }
 867         }
 868         list_del(&timer->device_list);
 869         mutex_unlock(&register_mutex);
 870
 871         if (timer->private_free)
 872                 timer->private_free(timer);
 873         kfree(timer);
 874         return 0;
 875 }
 876
 877 static int snd_timer_dev_free(struct snd_device *device)
 878 {
 879         struct snd_timer *timer = device->device_data;
 880         return snd_timer_free(timer);
 881 }
 882
 883 static int snd_timer_dev_register(struct snd_device *dev)
 884 {
 885         struct snd_timer *timer = dev->device_data;
 886         struct snd_timer *timer1;
 887
 888         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 889                 return -ENXIO;
 890         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 891             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 892                 return -EINVAL;
 893
 894         mutex_lock(&register_mutex);
 895         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 896                 if (timer1->tmr_class > timer->tmr_class)
 897                         break;
 898                 if (timer1->tmr_class < timer->tmr_class)
 899                         continue;
 900                 if (timer1->card && timer->card) {
 901                         if (timer1->card->number > timer->card->number)
 902                                 break;
 903                         if (timer1->card->number < timer->card->number)
 904                                 continue;
 905                 }
 906                 if (timer1->tmr_device > timer->tmr_device)
 907                         break;
 908                 if (timer1->tmr_device < timer->tmr_device)
 909                         continue;
 910                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 911                         break;
 912                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 913                         continue;
 914                 /* conflicts.. */
 915                 mutex_unlock(&register_mutex);
 916                 return -EBUSY;
 917         }
 918         list_add_tail(&timer->device_list, &timer1->device_list);
 919         mutex_unlock(&register_mutex);
 920         return 0;
 921 }
 922
 923 static int snd_timer_dev_disconnect(struct snd_device *device)
 924 {
 925         struct snd_timer *timer = device->device_data;
 926         mutex_lock(&register_mutex);
 927         list_del_init(&timer->device_list);
 928         mutex_unlock(&register_mutex);
 929         return 0;
 930 }
 931
 932 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 933 {
 934         unsigned long flags;
 935         unsigned long resolution = 0;
 936         struct snd_timer_instance *ti, *ts;
 937
 938         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 939                 return;
 940         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 941                        event > SNDRV_TIMER_EVENT_MRESUME))
 942                 return;
 943         spin_lock_irqsave(&timer->lock, flags);
 944         if (event == SNDRV_TIMER_EVENT_MSTART ||
 945             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 946             event == SNDRV_TIMER_EVENT_MRESUME) {
 947                 if (timer->hw.c_resolution)
 948                         resolution = timer->hw.c_resolution(timer);
 949                 else
 950                         resolution = timer->hw.resolution;
 951         }
 952         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 953                 if (ti->ccallback)
 954                         ti->ccallback(ti, event, tstamp, resolution);
 955                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 956                         if (ts->ccallback)
 957                                 ts->ccallback(ts, event, tstamp, resolution);
 958         }
 959         spin_unlock_irqrestore(&timer->lock, flags);
 960 }
 961
 962 /*
 963  * exported functions for global timers
 964  */
 965 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 966 {
 967         struct snd_timer_id tid;
 968
 969         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 970         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 971         tid.card = -1;
 972         tid.device = device;
 973         tid.subdevice = 0;
 974         return snd_timer_new(NULL, id, &tid, rtimer);
 975 }
 976
 977 int snd_timer_global_free(struct snd_timer *timer)
 978 {
 979         return snd_timer_free(timer);
 980 }
 981
 982 int snd_timer_global_register(struct snd_timer *timer)
 983 {
 984         struct snd_device dev;
 985
 986         memset(&dev, 0, sizeof(dev));
 987         dev.device_data = timer;
 988         return snd_timer_dev_register(&dev);
 989 }
 990
 991 /*
 992  *  System timer
 993  */
 994
 995 struct snd_timer_system_private {
 996         struct timer_list tlist;
 997         unsigned long last_expires;
 998         unsigned long last_jiffies;
 999         unsigned long correction;
1000 };
1001
1002 static void snd_timer_s_function(unsigned long data)
1003 {
1004         struct snd_timer *timer = (struct snd_timer *)data;
1005         struct snd_timer_system_private *priv = timer->private_data;
1006         unsigned long jiff = jiffies;
1007         if (time_after(jiff, priv->last_expires))
1008                 priv->correction += (long)jiff - (long)priv->last_expires;
1009         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1010 }
1011
1012 static int snd_timer_s_start(struct snd_timer * timer)
1013 {
1014         struct snd_timer_system_private *priv;
1015         unsigned long njiff;
1016
1017         priv = (struct snd_timer_system_private *) timer->private_data;
1018         njiff = (priv->last_jiffies = jiffies);
1019         if (priv->correction > timer->sticks - 1) {
1020                 priv->correction -= timer->sticks - 1;
1021                 njiff++;
1022         } else {
1023                 njiff += timer->sticks - priv->correction;
1024                 priv->correction = 0;
1025         }
1026         priv->last_expires = njiff;
1027         mod_timer(&priv->tlist, njiff);
1028         return 0;
1029 }
1030
1031 static int snd_timer_s_stop(struct snd_timer * timer)
1032 {
1033         struct snd_timer_system_private *priv;
1034         unsigned long jiff;
1035
1036         priv = (struct snd_timer_system_private *) timer->private_data;
1037         del_timer(&priv->tlist);
1038         jiff = jiffies;
1039         if (time_before(jiff, priv->last_expires))
1040                 timer->sticks = priv->last_expires - jiff;
1041         else
1042                 timer->sticks = 1;
1043         priv->correction = 0;
1044         return 0;
1045 }
1046
1047 static struct snd_timer_hardware snd_timer_system =
1048 {
1049         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1050         .resolution =   1000000000L / HZ,
1051         .ticks =        10000000L,
1052         .start =        snd_timer_s_start,
1053         .stop =         snd_timer_s_stop
1054 };
1055
1056 static void snd_timer_free_system(struct snd_timer *timer)
1057 {
1058         kfree(timer->private_data);
1059 }
1060
1061 static int snd_timer_register_system(void)
1062 {
1063         struct snd_timer *timer;
1064         struct snd_timer_system_private *priv;
1065         int err;
1066
1067         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1068         if (err < 0)
1069                 return err;
1070         strcpy(timer->name, "system timer");
1071         timer->hw = snd_timer_system;
1072         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1073         if (priv == NULL) {
1074                 snd_timer_free(timer);
1075                 return -ENOMEM;
1076         }
1077         init_timer(&priv->tlist);
1078         priv->tlist.function = snd_timer_s_function;
1079         priv->tlist.data = (unsigned long) timer;
1080         timer->private_data = priv;
1081         timer->private_free = snd_timer_free_system;
1082         return snd_timer_global_register(timer);
1083 }
1084
1085 #ifdef CONFIG_PROC_FS
1086 /*
1087  *  Info interface
1088  */
1089
1090 static void snd_timer_proc_read(struct snd_info_entry *entry,
1091                                 struct snd_info_buffer *buffer)
1092 {
1093         struct snd_timer *timer;
1094         struct snd_timer_instance *ti;
1095
1096         mutex_lock(&register_mutex);
1097         list_for_each_entry(timer, &snd_timer_list, device_list) {
1098                 switch (timer->tmr_class) {
1099                 case SNDRV_TIMER_CLASS_GLOBAL:
1100                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1101                         break;
1102                 case SNDRV_TIMER_CLASS_CARD:
1103                         snd_iprintf(buffer, "C%i-%i: ",
1104                                     timer->card->number, timer->tmr_device);
1105                         break;
1106                 case SNDRV_TIMER_CLASS_PCM:
1107                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1108                                     timer->tmr_device, timer->tmr_subdevice);
1109                         break;
1110                 default:
1111                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1112                                     timer->card ? timer->card->number : -1,
1113                                     timer->tmr_device, timer->tmr_subdevice);
1114                 }
1115                 snd_iprintf(buffer, "%s :", timer->name);
1116                 if (timer->hw.resolution)
1117                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1118                                     timer->hw.resolution / 1000,
1119                                     timer->hw.resolution % 1000,
1120                                     timer->hw.ticks);
1121                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1122                         snd_iprintf(buffer, " SLAVE");
1123                 snd_iprintf(buffer, "\n");
1124                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1125                         snd_iprintf(buffer, "  Client %s : %s\n",
1126                                     ti->owner ? ti->owner : "unknown",
1127                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1128                                                  SNDRV_TIMER_IFLG_RUNNING)
1129                                     ? "running" : "stopped");
1130         }
1131         mutex_unlock(&register_mutex);
1132 }
1133
1134 static struct snd_info_entry *snd_timer_proc_entry;
1135
1136 static void __init snd_timer_proc_init(void)
1137 {
1138         struct snd_info_entry *entry;
1139
1140         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1141         if (entry != NULL) {
1142                 entry->c.text.read = snd_timer_proc_read;
1143                 if (snd_info_register(entry) < 0) {
1144                         snd_info_free_entry(entry);
1145                         entry = NULL;
1146                 }
1147         }
1148         snd_timer_proc_entry = entry;
1149 }
1150
1151 static void __exit snd_timer_proc_done(void)
1152 {
1153         snd_info_free_entry(snd_timer_proc_entry);
1154 }
1155 #else /* !CONFIG_PROC_FS */
1156 #define snd_timer_proc_init()
1157 #define snd_timer_proc_done()
1158 #endif
1159
1160 /*
1161  *  USER SPACE interface
1162  */
1163
1164 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1165                                      unsigned long resolution,
1166                                      unsigned long ticks)
1167 {
1168         struct snd_timer_user *tu = timeri->callback_data;
1169         struct snd_timer_read *r;
1170         int prev;
1171
1172         spin_lock(&tu->qlock);
1173         if (tu->qused > 0) {
1174                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1175                 r = &tu->queue[prev];
1176                 if (r->resolution == resolution) {
1177                         r->ticks += ticks;
1178                         goto __wake;
1179                 }
1180         }
1181         if (tu->qused >= tu->queue_size) {
1182                 tu->overrun++;
1183         } else {
1184                 r = &tu->queue[tu->qtail++];
1185                 tu->qtail %= tu->queue_size;
1186                 r->resolution = resolution;
1187                 r->ticks = ticks;
1188                 tu->qused++;
1189         }
1190       __wake:
1191         spin_unlock(&tu->qlock);
1192         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1193         wake_up(&tu->qchange_sleep);
1194 }
1195
1196 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1197                                             struct snd_timer_tread *tread)
1198 {
1199         if (tu->qused >= tu->queue_size) {
1200                 tu->overrun++;
1201         } else {
1202                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1203                 tu->qtail %= tu->queue_size;
1204                 tu->qused++;
1205         }
1206 }
1207
1208 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1209                                      int event,
1210                                      struct timespec *tstamp,
1211                                      unsigned long resolution)
1212 {
1213         struct snd_timer_user *tu = timeri->callback_data;
1214         struct snd_timer_tread r1;
1215         unsigned long flags;
1216
1217         if (event >= SNDRV_TIMER_EVENT_START &&
1218             event <= SNDRV_TIMER_EVENT_PAUSE)
1219                 tu->tstamp = *tstamp;
1220         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1221                 return;
1222         memset(&r1, 0, sizeof(r1));
1223         r1.event = event;
1224         r1.tstamp = *tstamp;
1225         r1.val = resolution;
1226         spin_lock_irqsave(&tu->qlock, flags);
1227         snd_timer_user_append_to_tqueue(tu, &r1);
1228         spin_unlock_irqrestore(&tu->qlock, flags);
1229         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1230         wake_up(&tu->qchange_sleep);
1231 }
1232
1233 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1234                                       unsigned long resolution,
1235                                       unsigned long ticks)
1236 {
1237         struct snd_timer_user *tu = timeri->callback_data;
1238         struct snd_timer_tread *r, r1;
1239         struct timespec tstamp;
1240         int prev, append = 0;
1241
1242         memset(&tstamp, 0, sizeof(tstamp));
1243         spin_lock(&tu->qlock);
1244         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1245                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1246                 spin_unlock(&tu->qlock);
1247                 return;
1248         }
1249         if (tu->last_resolution != resolution || ticks > 0) {
1250                 if (timer_tstamp_monotonic)
1251                         do_posix_clock_monotonic_gettime(&tstamp);
1252                 else
1253                         getnstimeofday(&tstamp);
1254         }
1255         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1256             tu->last_resolution != resolution) {
1257                 memset(&r1, 0, sizeof(r1));
1258                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1259                 r1.tstamp = tstamp;
1260                 r1.val = resolution;
1261                 snd_timer_user_append_to_tqueue(tu, &r1);
1262                 tu->last_resolution = resolution;
1263                 append++;
1264         }
1265         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1266                 goto __wake;
1267         if (ticks == 0)
1268                 goto __wake;
1269         if (tu->qused > 0) {
1270                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1271                 r = &tu->tqueue[prev];
1272                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1273                         r->tstamp = tstamp;
1274                         r->val += ticks;
1275                         append++;
1276                         goto __wake;
1277                 }
1278         }
1279         r1.event = SNDRV_TIMER_EVENT_TICK;
1280         r1.tstamp = tstamp;
1281         r1.val = ticks;
1282         snd_timer_user_append_to_tqueue(tu, &r1);
1283         append++;
1284       __wake:
1285         spin_unlock(&tu->qlock);
1286         if (append == 0)
1287                 return;
1288         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1289         wake_up(&tu->qchange_sleep);
1290 }
1291
1292 static int snd_timer_user_open(struct inode *inode, struct file *file)
1293 {
1294         struct snd_timer_user *tu;
1295         int err;
1296
1297         err = nonseekable_open(inode, file);
1298         if (err < 0)
1299                 return err;
1300
1301         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1302         if (tu == NULL)
1303                 return -ENOMEM;
1304         spin_lock_init(&tu->qlock);
1305         init_waitqueue_head(&tu->qchange_sleep);
1306         mutex_init(&tu->ioctl_lock);
1307         tu->ticks = 1;
1308         tu->queue_size = 128;
1309         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1310                             GFP_KERNEL);
1311         if (tu->queue == NULL) {
1312                 kfree(tu);
1313                 return -ENOMEM;
1314         }
1315         file->private_data = tu;
1316         return 0;
1317 }
1318
1319 static int snd_timer_user_release(struct inode *inode, struct file *file)
1320 {
1321         struct snd_timer_user *tu;
1322
1323         if (file->private_data) {
1324                 tu = file->private_data;
1325                 file->private_data = NULL;
1326                 mutex_lock(&tu->ioctl_lock);
1327                 if (tu->timeri)
1328                         snd_timer_close(tu->timeri);
1329                 mutex_unlock(&tu->ioctl_lock);
1330                 kfree(tu->queue);
1331                 kfree(tu->tqueue);
1332                 kfree(tu);
1333         }
1334         return 0;
1335 }
1336
1337 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1338 {
1339         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1340         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1341         id->card = -1;
1342         id->device = -1;
1343         id->subdevice = -1;
1344 }
1345
1346 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1347 {
1348         id->dev_class = timer->tmr_class;
1349         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1350         id->card = timer->card ? timer->card->number : -1;
1351         id->device = timer->tmr_device;
1352         id->subdevice = timer->tmr_subdevice;
1353 }
1354
1355 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1356 {
1357         struct snd_timer_id id;
1358         struct snd_timer *timer;
1359         struct list_head *p;
1360
1361         if (copy_from_user(&id, _tid, sizeof(id)))
1362                 return -EFAULT;
1363         mutex_lock(&register_mutex);
1364         if (id.dev_class < 0) {         /* first item */
1365                 if (list_empty(&snd_timer_list))
1366                         snd_timer_user_zero_id(&id);
1367                 else {
1368                         timer = list_entry(snd_timer_list.next,
1369                                            struct snd_timer, device_list);
1370                         snd_timer_user_copy_id(&id, timer);
1371                 }
1372         } else {
1373                 switch (id.dev_class) {
1374                 case SNDRV_TIMER_CLASS_GLOBAL:
1375                         id.device = id.device < 0 ? 0 : id.device + 1;
1376                         list_for_each(p, &snd_timer_list) {
1377                                 timer = list_entry(p, struct snd_timer, device_list);
1378                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1379                                         snd_timer_user_copy_id(&id, timer);
1380                                         break;
1381                                 }
1382                                 if (timer->tmr_device >= id.device) {
1383                                         snd_timer_user_copy_id(&id, timer);
1384                                         break;
1385                                 }
1386                         }
1387                         if (p == &snd_timer_list)
1388                                 snd_timer_user_zero_id(&id);
1389                         break;
1390                 case SNDRV_TIMER_CLASS_CARD:
1391                 case SNDRV_TIMER_CLASS_PCM:
1392                         if (id.card < 0) {
1393                                 id.card = 0;
1394                         } else {
1395                                 if (id.card < 0) {
1396                                         id.card = 0;
1397                                 } else {
1398                                         if (id.device < 0) {
1399                                                 id.device = 0;
1400                                         } else {
1401                                                 if (id.subdevice < 0) {
1402                                                         id.subdevice = 0;
1403                                                 } else {
1404                                                         id.subdevice++;
1405                                                 }
1406                                         }
1407                                 }
1408                         }
1409                         list_for_each(p, &snd_timer_list) {
1410                                 timer = list_entry(p, struct snd_timer, device_list);
1411                                 if (timer->tmr_class > id.dev_class) {
1412                                         snd_timer_user_copy_id(&id, timer);
1413                                         break;
1414                                 }
1415                                 if (timer->tmr_class < id.dev_class)
1416                                         continue;
1417                                 if (timer->card->number > id.card) {
1418                                         snd_timer_user_copy_id(&id, timer);
1419                                         break;
1420                                 }
1421                                 if (timer->card->number < id.card)
1422                                         continue;
1423                                 if (timer->tmr_device > id.device) {
1424                                         snd_timer_user_copy_id(&id, timer);
1425                                         break;
1426                                 }
1427                                 if (timer->tmr_device < id.device)
1428                                         continue;
1429                                 if (timer->tmr_subdevice > id.subdevice) {
1430                                         snd_timer_user_copy_id(&id, timer);
1431                                         break;
1432                                 }
1433                                 if (timer->tmr_subdevice < id.subdevice)
1434                                         continue;
1435                                 snd_timer_user_copy_id(&id, timer);
1436                                 break;
1437                         }
1438                         if (p == &snd_timer_list)
1439                                 snd_timer_user_zero_id(&id);
1440                         break;
1441                 default:
1442                         snd_timer_user_zero_id(&id);
1443                 }
1444         }
1445         mutex_unlock(&register_mutex);
1446         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1447                 return -EFAULT;
1448         return 0;
1449 }
1450
1451 static int snd_timer_user_ginfo(struct file *file,
1452                                 struct snd_timer_ginfo __user *_ginfo)
1453 {
1454         struct snd_timer_ginfo *ginfo;
1455         struct snd_timer_id tid;
1456         struct snd_timer *t;
1457         struct list_head *p;
1458         int err = 0;
1459
1460         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1461         if (IS_ERR(ginfo))
1462                 return PTR_ERR(ginfo);
1463
1464         tid = ginfo->tid;
1465         memset(ginfo, 0, sizeof(*ginfo));
1466         ginfo->tid = tid;
1467         mutex_lock(&register_mutex);
1468         t = snd_timer_find(&tid);
1469         if (t != NULL) {
1470                 ginfo->card = t->card ? t->card->number : -1;
1471                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1472                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1473                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1474                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1475                 ginfo->resolution = t->hw.resolution;
1476                 if (t->hw.resolution_min > 0) {
1477                         ginfo->resolution_min = t->hw.resolution_min;
1478                         ginfo->resolution_max = t->hw.resolution_max;
1479                 }
1480                 list_for_each(p, &t->open_list_head) {
1481                         ginfo->clients++;
1482                 }
1483         } else {
1484                 err = -ENODEV;
1485         }
1486         mutex_unlock(&register_mutex);
1487         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1488                 err = -EFAULT;
1489         kfree(ginfo);
1490         return err;
1491 }
1492
1493 static int snd_timer_user_gparams(struct file *file,
1494                                   struct snd_timer_gparams __user *_gparams)
1495 {
1496         struct snd_timer_gparams gparams;
1497         struct snd_timer *t;
1498         int err;
1499
1500         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1501                 return -EFAULT;
1502         mutex_lock(&register_mutex);
1503         t = snd_timer_find(&gparams.tid);
1504         if (!t) {
1505                 err = -ENODEV;
1506                 goto _error;
1507         }
1508         if (!list_empty(&t->open_list_head)) {
1509                 err = -EBUSY;
1510                 goto _error;
1511         }
1512         if (!t->hw.set_period) {
1513                 err = -ENOSYS;
1514                 goto _error;
1515         }
1516         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1517 _error:
1518         mutex_unlock(&register_mutex);
1519         return err;
1520 }
1521
1522 static int snd_timer_user_gstatus(struct file *file,
1523                                   struct snd_timer_gstatus __user *_gstatus)
1524 {
1525         struct snd_timer_gstatus gstatus;
1526         struct snd_timer_id tid;
1527         struct snd_timer *t;
1528         int err = 0;
1529
1530         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1531                 return -EFAULT;
1532         tid = gstatus.tid;
1533         memset(&gstatus, 0, sizeof(gstatus));
1534         gstatus.tid = tid;
1535         mutex_lock(&register_mutex);
1536         t = snd_timer_find(&tid);
1537         if (t != NULL) {
1538                 if (t->hw.c_resolution)
1539                         gstatus.resolution = t->hw.c_resolution(t);
1540                 else
1541                         gstatus.resolution = t->hw.resolution;
1542                 if (t->hw.precise_resolution) {
1543                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1544                                                  &gstatus.resolution_den);
1545                 } else {
1546                         gstatus.resolution_num = gstatus.resolution;
1547                         gstatus.resolution_den = 1000000000uL;
1548                 }
1549         } else {
1550                 err = -ENODEV;
1551         }
1552         mutex_unlock(&register_mutex);
1553         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1554                 err = -EFAULT;
1555         return err;
1556 }
1557
1558 static int snd_timer_user_tselect(struct file *file,
1559                                   struct snd_timer_select __user *_tselect)
1560 {
1561         struct snd_timer_user *tu;
1562         struct snd_timer_select tselect;
1563         char str[32];
1564         int err = 0;
1565
1566         tu = file->private_data;
1567         if (tu->timeri) {
1568                 snd_timer_close(tu->timeri);
1569                 tu->timeri = NULL;
1570         }
1571         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1572                 err = -EFAULT;
1573                 goto __err;
1574         }
1575         sprintf(str, "application %i", current->pid);
1576         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1577                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1578         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1579         if (err < 0)
1580                 goto __err;
1581
1582         kfree(tu->queue);
1583         tu->queue = NULL;
1584         kfree(tu->tqueue);
1585         tu->tqueue = NULL;
1586         if (tu->tread) {
1587                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1588                                      GFP_KERNEL);
1589                 if (tu->tqueue == NULL)
1590                         err = -ENOMEM;
1591         } else {
1592                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1593                                     GFP_KERNEL);
1594                 if (tu->queue == NULL)
1595                         err = -ENOMEM;
1596         }
1597
1598         if (err < 0) {
1599                 snd_timer_close(tu->timeri);
1600                 tu->timeri = NULL;
1601         } else {
1602                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1603                 tu->timeri->callback = tu->tread
1604                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1605                 tu->timeri->ccallback = snd_timer_user_ccallback;
1606                 tu->timeri->callback_data = (void *)tu;
1607         }
1608
1609       __err:
1610         return err;
1611 }
1612
1613 static int snd_timer_user_info(struct file *file,
1614                                struct snd_timer_info __user *_info)
1615 {
1616         struct snd_timer_user *tu;
1617         struct snd_timer_info *info;
1618         struct snd_timer *t;
1619         int err = 0;
1620
1621         tu = file->private_data;
1622         if (!tu->timeri)
1623                 return -EBADFD;
1624         t = tu->timeri->timer;
1625         if (!t)
1626                 return -EBADFD;
1627
1628         info = kzalloc(sizeof(*info), GFP_KERNEL);
1629         if (! info)
1630                 return -ENOMEM;
1631         info->card = t->card ? t->card->number : -1;
1632         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1633                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1634         strlcpy(info->id, t->id, sizeof(info->id));
1635         strlcpy(info->name, t->name, sizeof(info->name));
1636         info->resolution = t->hw.resolution;
1637         if (copy_to_user(_info, info, sizeof(*_info)))
1638                 err = -EFAULT;
1639         kfree(info);
1640         return err;
1641 }
1642
1643 static int snd_timer_user_params(struct file *file,
1644                                  struct snd_timer_params __user *_params)
1645 {
1646         struct snd_timer_user *tu;
1647         struct snd_timer_params params;
1648         struct snd_timer *t;
1649         struct snd_timer_read *tr;
1650         struct snd_timer_tread *ttr;
1651         int err;
1652
1653         tu = file->private_data;
1654         if (!tu->timeri)
1655                 return -EBADFD;
1656         t = tu->timeri->timer;
1657         if (!t)
1658                 return -EBADFD;
1659         if (copy_from_user(&params, _params, sizeof(params)))
1660                 return -EFAULT;
1661         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1662                 err = -EINVAL;
1663                 goto _end;
1664         }
1665         if (params.queue_size > 0 &&
1666             (params.queue_size < 32 || params.queue_size > 1024)) {
1667                 err = -EINVAL;
1668                 goto _end;
1669         }
1670         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1671                               (1<<SNDRV_TIMER_EVENT_TICK)|
1672                               (1<<SNDRV_TIMER_EVENT_START)|
1673                               (1<<SNDRV_TIMER_EVENT_STOP)|
1674                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1675                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1676                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1677                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1678                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1679                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1680                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1681                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1682                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1683                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1684                 err = -EINVAL;
1685                 goto _end;
1686         }
1687         snd_timer_stop(tu->timeri);
1688         spin_lock_irq(&t->lock);
1689         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1690                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1691                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1692         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1693                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1694         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1695                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1696         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1697                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1698         spin_unlock_irq(&t->lock);
1699         if (params.queue_size > 0 &&
1700             (unsigned int)tu->queue_size != params.queue_size) {
1701                 if (tu->tread) {
1702                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1703                                       GFP_KERNEL);
1704                         if (ttr) {
1705                                 kfree(tu->tqueue);
1706                                 tu->queue_size = params.queue_size;
1707                                 tu->tqueue = ttr;
1708                         }
1709                 } else {
1710                         tr = kmalloc(params.queue_size * sizeof(*tr),
1711                                      GFP_KERNEL);
1712                         if (tr) {
1713                                 kfree(tu->queue);
1714                                 tu->queue_size = params.queue_size;
1715                                 tu->queue = tr;
1716                         }
1717                 }
1718         }
1719         tu->qhead = tu->qtail = tu->qused = 0;
1720         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1721                 if (tu->tread) {
1722                         struct snd_timer_tread tread;
1723                         memset(&tread, 0, sizeof(tread));
1724                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1725                         tread.tstamp.tv_sec = 0;
1726                         tread.tstamp.tv_nsec = 0;
1727                         tread.val = 0;
1728                         snd_timer_user_append_to_tqueue(tu, &tread);
1729                 } else {
1730                         struct snd_timer_read *r = &tu->queue[0];
1731                         r->resolution = 0;
1732                         r->ticks = 0;
1733                         tu->qused++;
1734                         tu->qtail++;
1735                 }
1736         }
1737         tu->filter = params.filter;
1738         tu->ticks = params.ticks;
1739         err = 0;
1740  _end:
1741         if (copy_to_user(_params, &params, sizeof(params)))
1742                 return -EFAULT;
1743         return err;
1744 }
1745
1746 static int snd_timer_user_status(struct file *file,
1747                                  struct snd_timer_status __user *_status)
1748 {
1749         struct snd_timer_user *tu;
1750         struct snd_timer_status status;
1751
1752         tu = file->private_data;
1753         if (!tu->timeri)
1754                 return -EBADFD;
1755         memset(&status, 0, sizeof(status));
1756         status.tstamp = tu->tstamp;
1757         status.resolution = snd_timer_resolution(tu->timeri);
1758         status.lost = tu->timeri->lost;
1759         status.overrun = tu->overrun;
1760         spin_lock_irq(&tu->qlock);
1761         status.queue = tu->qused;
1762         spin_unlock_irq(&tu->qlock);
1763         if (copy_to_user(_status, &status, sizeof(status)))
1764                 return -EFAULT;
1765         return 0;
1766 }
1767
1768 static int snd_timer_user_start(struct file *file)
1769 {
1770         int err;
1771         struct snd_timer_user *tu;
1772
1773         tu = file->private_data;
1774         if (!tu->timeri)
1775                 return -EBADFD;
1776         snd_timer_stop(tu->timeri);
1777         tu->timeri->lost = 0;
1778         tu->last_resolution = 0;
1779         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1780 }
1781
1782 static int snd_timer_user_stop(struct file *file)
1783 {
1784         int err;
1785         struct snd_timer_user *tu;
1786
1787         tu = file->private_data;
1788         if (!tu->timeri)
1789                 return -EBADFD;
1790         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1791 }
1792
1793 static int snd_timer_user_continue(struct file *file)
1794 {
1795         int err;
1796         struct snd_timer_user *tu;
1797
1798         tu = file->private_data;
1799         if (!tu->timeri)
1800                 return -EBADFD;
1801         tu->timeri->lost = 0;
1802         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1803 }
1804
1805 static int snd_timer_user_pause(struct file *file)
1806 {
1807         int err;
1808         struct snd_timer_user *tu;
1809
1810         tu = file->private_data;
1811         if (!tu->timeri)
1812                 return -EBADFD;
1813         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1814 }
1815
1816 enum {
1817         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1818         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1819         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1820         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1821 };
1822
1823 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1824                                  unsigned long arg)
1825 {
1826         struct snd_timer_user *tu;
1827         void __user *argp = (void __user *)arg;
1828         int __user *p = argp;
1829
1830         tu = file->private_data;
1831         switch (cmd) {
1832         case SNDRV_TIMER_IOCTL_PVERSION:
1833                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1834         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1835                 return snd_timer_user_next_device(argp);
1836         case SNDRV_TIMER_IOCTL_TREAD:
1837         {
1838                 int xarg;
1839
1840                 if (tu->timeri) /* too late */
1841                         return -EBUSY;
1842                 if (get_user(xarg, p))
1843                         return -EFAULT;
1844                 tu->tread = xarg ? 1 : 0;
1845                 return 0;
1846         }
1847         case SNDRV_TIMER_IOCTL_GINFO:
1848                 return snd_timer_user_ginfo(file, argp);
1849         case SNDRV_TIMER_IOCTL_GPARAMS:
1850                 return snd_timer_user_gparams(file, argp);
1851         case SNDRV_TIMER_IOCTL_GSTATUS:
1852                 return snd_timer_user_gstatus(file, argp);
1853         case SNDRV_TIMER_IOCTL_SELECT:
1854                 return snd_timer_user_tselect(file, argp);
1855         case SNDRV_TIMER_IOCTL_INFO:
1856                 return snd_timer_user_info(file, argp);
1857         case SNDRV_TIMER_IOCTL_PARAMS:
1858                 return snd_timer_user_params(file, argp);
1859         case SNDRV_TIMER_IOCTL_STATUS:
1860                 return snd_timer_user_status(file, argp);
1861         case SNDRV_TIMER_IOCTL_START:
1862         case SNDRV_TIMER_IOCTL_START_OLD:
1863                 return snd_timer_user_start(file);
1864         case SNDRV_TIMER_IOCTL_STOP:
1865         case SNDRV_TIMER_IOCTL_STOP_OLD:
1866                 return snd_timer_user_stop(file);
1867         case SNDRV_TIMER_IOCTL_CONTINUE:
1868         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1869                 return snd_timer_user_continue(file);
1870         case SNDRV_TIMER_IOCTL_PAUSE:
1871         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1872                 return snd_timer_user_pause(file);
1873         }
1874         return -ENOTTY;
1875 }
1876
1877 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1878                                  unsigned long arg)
1879 {
1880         struct snd_timer_user *tu = file->private_data;
1881         long ret;
1882
1883         mutex_lock(&tu->ioctl_lock);
1884         ret = __snd_timer_user_ioctl(file, cmd, arg);
1885         mutex_unlock(&tu->ioctl_lock);
1886         return ret;
1887 }
1888
1889 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1890 {
1891         struct snd_timer_user *tu;
1892
1893         tu = file->private_data;
1894         return fasync_helper(fd, file, on, &tu->fasync);
1895 }
1896
1897 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1898                                    size_t count, loff_t *offset)
1899 {
1900         struct snd_timer_user *tu;
1901         long result = 0, unit;
1902         int qhead;
1903         int err = 0;
1904
1905         tu = file->private_data;
1906         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1907         spin_lock_irq(&tu->qlock);
1908         while ((long)count - result >= unit) {
1909                 while (!tu->qused) {
1910                         wait_queue_t wait;
1911
1912                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1913                                 err = -EAGAIN;
1914                                 goto _error;
1915                         }
1916
1917                         set_current_state(TASK_INTERRUPTIBLE);
1918                         init_waitqueue_entry(&wait, current);
1919                         add_wait_queue(&tu->qchange_sleep, &wait);
1920
1921                         spin_unlock_irq(&tu->qlock);
1922                         schedule();
1923                         spin_lock_irq(&tu->qlock);
1924
1925                         remove_wait_queue(&tu->qchange_sleep, &wait);
1926
1927                         if (signal_pending(current)) {
1928                                 err = -ERESTARTSYS;
1929                                 goto _error;
1930                         }
1931                 }
1932
1933                 qhead = tu->qhead++;
1934                 tu->qhead %= tu->queue_size;
1935                 tu->qused--;
1936                 spin_unlock_irq(&tu->qlock);
1937
1938                 mutex_lock(&tu->ioctl_lock);
1939                 if (tu->tread) {
1940                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1941                                          sizeof(struct snd_timer_tread)))
1942                                 err = -EFAULT;
1943                 } else {
1944                         if (copy_to_user(buffer, &tu->queue[qhead],
1945                                          sizeof(struct snd_timer_read)))
1946                                 err = -EFAULT;
1947                 }
1948                 mutex_unlock(&tu->ioctl_lock);
1949
1950                 spin_lock_irq(&tu->qlock);
1951                 if (err < 0)
1952                         goto _error;
1953                 result += unit;
1954                 buffer += unit;
1955         }
1956  _error:
1957         spin_unlock_irq(&tu->qlock);
1958         return result > 0 ? result : err;
1959 }
1960
1961 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1962 {
1963         unsigned int mask;
1964         struct snd_timer_user *tu;
1965
1966         tu = file->private_data;
1967
1968         poll_wait(file, &tu->qchange_sleep, wait);
1969
1970         mask = 0;
1971         if (tu->qused)
1972                 mask |= POLLIN | POLLRDNORM;
1973
1974         return mask;
1975 }
1976
1977 #ifdef CONFIG_COMPAT
1978 #include "timer_compat.c"
1979 #else
1980 #define snd_timer_user_ioctl_compat     NULL
1981 #endif
1982
1983 static const struct file_operations snd_timer_f_ops =
1984 {
1985         .owner =        THIS_MODULE,
1986         .read =         snd_timer_user_read,
1987         .open =         snd_timer_user_open,
1988         .release =      snd_timer_user_release,
1989         .llseek =       no_llseek,
1990         .poll =         snd_timer_user_poll,
1991         .unlocked_ioctl =       snd_timer_user_ioctl,
1992         .compat_ioctl = snd_timer_user_ioctl_compat,
1993         .fasync =       snd_timer_user_fasync,
1994 };
1995
1996 /*
1997  *  ENTRY functions
1998  */
1999
2000 static int __init alsa_timer_init(void)
2001 {
2002         int err;
2003
2004 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2005         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2006                               "system timer");
2007 #endif
2008
2009         if ((err = snd_timer_register_system()) < 0)
2010                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
2011                            err);
2012         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2013                                        &snd_timer_f_ops, NULL, "timer")) < 0)
2014                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
2015                            err);
2016         snd_timer_proc_init();
2017         return 0;
2018 }
2019
2020 static void __exit alsa_timer_exit(void)
2021 {
2022         struct list_head *p, *n;
2023
2024         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2025         /* unregister the system timer */
2026         list_for_each_safe(p, n, &snd_timer_list) {
2027                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2028                 snd_timer_free(timer);
2029         }
2030         snd_timer_proc_done();
2031 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2032         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2033 #endif
2034 }
2035
2036 module_init(alsa_timer_init)
2037 module_exit(alsa_timer_exit)
2038
2039 EXPORT_SYMBOL(snd_timer_open);
2040 EXPORT_SYMBOL(snd_timer_close);
2041 EXPORT_SYMBOL(snd_timer_resolution);
2042 EXPORT_SYMBOL(snd_timer_start);
2043 EXPORT_SYMBOL(snd_timer_stop);
2044 EXPORT_SYMBOL(snd_timer_continue);
2045 EXPORT_SYMBOL(snd_timer_pause);
2046 EXPORT_SYMBOL(snd_timer_new);
2047 EXPORT_SYMBOL(snd_timer_notify);
2048 EXPORT_SYMBOL(snd_timer_global_new);
2049 EXPORT_SYMBOL(snd_timer_global_free);
2050 EXPORT_SYMBOL(snd_timer_global_register);
2051 EXPORT_SYMBOL(snd_timer_interrupt);